Air-compressor



(No Model.) 2 Sheets-Sheet 1.

' M. HARROLD.

AIR COMPRESSOR.

No. 345,969. Patented July 20, 1886.

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UNITED STATES PATENT OFFicE.

MAHLON HARROLD, OF FORT WORTH, TEXAS.

AlR -COMPRESSOR.

EZPECIFICATION forming part of Letters Patent No. 345,969, dated July 20, 1886.

Application filed May 12, 1885.

T0 rtZZ whom it 'nmy concern.-

Be it known that I, MAHLON HARROLD, a citizen of the United States, and a resident of Fort iVorth, in the county of Tarrant and State of Texas, have invented certain new and use fnl Improvements in Air-Compressors; and I do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same, reference being had to the aecompanyi n g draw ings, which form a part of this specification, and in which- Figure 1 is a side view of myimproved aircompressor. Fig. 2 is a longitudinal vertical sectional view of the same. Fig. 3 is a longitudinal horizontal sectional view taken on the line or m in Figs. 1 and 2. Fig. 4 is a vertical transverse sectional view taken on the line 7 y in Figs. 1 and 2; and Fig. 5 isadetail view of the inside of a portion of one of the sides of the casing, showing the packingplate.

The same letters refer to the same parts in all the figures.

This invention relates to air'compressors or mechanical devices for compressing air; and it has for its object to provide a device of this class which shall possess superior advantages in point of simplicity, durability, and general efficiency, which shall require but little power in running, and by means of which air may be compressed to any desired density.

With these ends in view the invention conr sists in the improved construction, arrangeable shape, with exception of the central portion of the bottom of the rim, which should terminate in a point, D, formed at the intersection of two adjacent segmental curves,EE, concentric with the axes of the shafts F F, which are journalcd transversely in the cas Serial No. 105,246. (No model.)

ing, the sides of which are provided with stuffing-boxes G G, in order to render the j oints air-tight. It is also to be understood that these segmental curves shall be nearer the axes F F than any other points of the rim of the casing. The ends of the shafts F F are to be journaled in suitable boxes, H H, in a frame,

I, which may serve to support the casin The shafts F F carry within the casing a 6c pair of spur or cog wheels or toothed cylinders, I 1, having intermeshing teeth J J, which are so disposed that the ends of the teeth of the one shall fit tightly against the interdental spaces of the other when the wheels 6 revolve, as will be seen in Fig. 2 of the drawings, where the contact-point, which is denoted In order to increase the certainty of this, packing K may be placed in the intcrdental spaces of each wheel. The ends of the teeth of each wheel should also fit tightly against the seg- 1nentally-curved portions E of the rim of the casing, over which is placed a packing-plate,

L, which may either be of itself elastic, so as to be held in constant contact with the ends of the teeth, or suitable springs, M, may be arranged in sockets N in the rim of the casing, for the purpose of forcing the wings of said plate into contact with the ends of the teeth.

The inner sides of the sides of the casing are provided with packing-plates O' 0, bearing against the sides of the lower portions of the wheels I l, as will be seen'in Fig. 4, the configuration of the packing-plates being as is clearly outlined in Fig. 5 of the drawings. By the several packing-plates described airtight joints are formed that will prevent the pas sage of air from one part of the casing to an other, as will be hereinafter more fully de- 0 scribed.

The front side of the casing is provided with an air-inlet port, 1?, opening into the casing at a point between the converging point of the curved portions E E of the rim of the casing, 5

and below a horizontal line drawn longitudinally through the axes of the shafts F F, the upper part of the casing has a suitably-located exhaust or outlet port, Q.

The front ends of the shafts F F are provid- :00

ed with spur-wheels R B, meshing together, and to one of the shafts power may be applied from any suitable source, thereby running the said shafts in opposite directions, as indicated by darts in Fig. 2 of the drawings.

The outlet-port Q is to be connected by a pipe, S, with a receiver, in which the air compressed by the apparatus may be stored, and whence it may be removed, whenever desired, and applied to any desired purpose.

The operation of this invention is as follows: The air on entering the casing through the port I? enters the spaces between the teeth of the wheels I 1, below the center line, a: a2, and is prevented from passing to the upper part of the casing by the packing between the said teeth and the several packing-plates herein described. As the wheels revolve, they will carry the air past the curved portions E E of the casing, and into the body of the latter, which is denoted by letter T, and whence it passes through. the outlet-port to the receiver in which, by continuing the operation, it may be compressed to any desired density. It will be observed that the arrangement of the packing-plates is such that while communication between the inlet and outlet ports is effectually cut off, there shall be but little frictional resistance; hence the operation of compressing the air may be performed with the smallest possible expenditure of power, the import ance of which neednot be enlarged upon. The general construction is simple and compact, and the device may be run successfully at a high rate of speed.

It is obvious that this device may be used with equal efficiency for the purpose of compressing other fiuids than air, or for the purpose of raising water and other liquids from wells and the like.

I am aware that it is not new to construct an air-compressor consisting of two rotating intermeshing rollers within a casing having elastic spring-pressed bearingplates secured upon the inner sides of the casing and bearing against the peripheries and ends of said rollers, and I do not claim such construction, broadly; but

I claim and desire to secure by Letters Patent of the UnitediStates 1. The combination, with a casing, the sides of which have an inlet and an outlet aperture, and a rim having an inwardly-pointed transverse projection, of a V-shaped elastic plate fitting upon said transverse projection, the sides of which plate are curved so that their outer edges bear against the peripheries of 5 of a plate secured upon each side of the casing, the lower part of which has a V-shaped notch, which engages with the V-shaped plate upon the transverse projection and holds it in place, one of said plates having an aperture registering with the aperture in the side of the casing, as shown and described.

In testimony that I claim the foregoing as my own I have hereunto ai'fixed my signature in presence of two witnesses.

MAHLON IIARROLD.

WVitnesses:

AUqUsr PETERSON, WM. BAG GER. 

